Xiaomi Smart Air Purifier 4 with True HEPA and Real-Time PM2.5 Display vs Dr Trust Orthopaedic Memory Foam Cervical Pillow for Neck Support
What separates them
These two differ on 7 recorded specifications. The Xiaomi Smart Air Purifier 4 with True HEPA and Real-Time PM2.5 Display is ₹10,500 dearer.
Xiaomi Smart Air Purifier 4 with True HEPA and Real-Time PM2.5 Display vs Dr Trust Orthopaedic Memory Foam Cervical Pillow for Neck Support
Xiaomi
Xiaomi Smart Air Purifier 4 with True HEPA and Real-Time PM2.5 Display
₹11,999
CADR is the only number worth comparing between purifiers, and 400 cubic metres per hour is genuinely high for the price -- it is the figure that decides how fast the room actually clears.
Full details →
Dr Trust
Dr Trust Orthopaedic Memory Foam Cervical Pillow for Neck Support
₹1,499
The two contour heights are not a gimmick: a side sleeper's neck needs roughly two centimetres more support than a back sleeper's, because the gap between head and mattress is the width of a shoulder.
Full details →Who the Xiaomi Smart Air Purifier 4 with True HEPA and Real-Time PM2.5 Display is for
Buy it if: Anyone in a north Indian city wanting real particulate clearance in a large room.
Avoid it if: Anyone unwilling to budget roughly Rs2,000 a year for filters -- a clogged filter is worse than none.
Who the Dr Trust Orthopaedic Memory Foam Cervical Pillow for Neck Support is for
Buy it if: Side or back sleepers waking with neck stiffness on a flat pillow.
Avoid it if: Front sleepers, for whom any contour pillow forces the neck into rotation.
Specifications, side by side
7 of 19 rows differ. Differences first.
| Specification | Xiaomi Smart Air Purifier 4 with True HEPA and Real-Time PM2.5 Display | Dr Trust Orthopaedic Memory Foam Cervical Pillow for Neck Support |
|---|---|---|
| Price | ₹11,999 | ₹1,499 |
| Clinical validation | CADR rated under GB/T 18801, the Chinese national standard | Not applicable -- this is a support product, not a measuring device |
| Connectivity | Wi-Fi 2.4 GHz, Mi Home app, Alexa and Google Home | None |
| Measurement range | Effective room size approximately 48 square metres | Contour heights 10 cm and 12 cm on opposite edges |
| Power source | Mains, 230 V, 33 W maximum | Not applicable |
| Regulatory status | BIS marked for electrical safety | Not a notified medical device |
| Stated accuracy | Built-in laser PM2.5 sensor, plus or minus 10 percent or 10 micrograms per cubic metre | Not applicable |
| Stored readings | Filter life tracking in the app | Not applicable |
| Warranty | 1 Year Manufacturer Warranty | 1 Year Manufacturer Warranty |
| Annual energy use | 96 kWh a year at 8 hours a day on auto, about Rs768 at Rs8 per unit | not published |
| Annual running cost | Roughly Rs2,600 -- Rs1,999 filter plus about Rs600 of electricity at 8 hours a day | not published |
| Break-in | not published | Memory foam is firm for the first week and softens |
| CADR | 400 cubic metres per hour, particulate | not published |
| Contour | not published | Butterfly profile, two heights |
| Cover | not published | Removable, machine washable |
| Fill | not published | Visco-elastic memory foam, 50 density |
| Filter | True HEPA H13, integrated with activated carbon | not published |
| Filter replacement cost | About Rs1,999, roughly every 6 to 12 months depending on air quality | not published |
| Noise | 32.1 dB on sleep mode | not published |
| Sleeping position | not published | Two heights for back and side sleeping |
Every row is a figure one or both products record. A blank is a figure the catalogue does not hold, not a zero.